Proposed changes to the short-term rental market must be applied to platforms such as Airbnb.
That's according to John Mark McCafferty, CEO of Threshold, who will appear before an Oireachtas Committee later.
He will discuss the Registration of Short-Term Tourist Letting Bill - along with representatives from the Irish Tourism Industry Confederation, Airbnb and Expedia Group.
The bill would see the establishment of a short-term tourist letting register, and a 21-night limit for renting out such properties.
Mr McCafferty told Newstalk Breakfast more housing is going to the short-term sector.
"This is about the registration of short-term tourist letting, for example like platforms such as Airbnb," he said.
"One of the big problems for us as we advise renters in the private rented sector is just the lack of housing.
"One of the reasons is because over recent years, houses [and] apartments that would have gone into the longer-term, private rented sector are going into short-term lets".
Mr McCafferty said enforcement is important.
"They are a register [sic], so the establishment of a short-term tourist letting register," he said.
"That lets the Department of Housing and the local authorities have a good sense of the short-term lets across the country.
"There'll be registration with Fáilte Ireland, there'll be authorised officials - so there'll be enforcement.
"That's really important, because there has been legislation before - but it just simply was not enforced.
"They're talking about 21 nights being the short-term let [limit]... and then updated penalties for any infringements".
Mr McCafferty said the bill must be applicable to all letting bodies.
"There's a need for greater clarity around how they define some of these services," he said.
"We're talking about those electronic travel platforms, such as Airbnb.
"We've a worry that certain providers might say, 'We don't fulfill that definition, so we're not covered by the legislation'.
"I suppose the second thing so there seems to be a contradiction between certain legislation.
"The Planning and Development Act defines short lets as 14 days; this bill defines it as 21 days.
"So we need some meeting of minds there," he added.
Listen back to the full interview below: